Table 3.

Summary of the reference data: number of training samples used to train the RF classifier and of validation data used to validate the classification accuracy of the “buildings class” (BC) and “other classes” (OC).

Test area	Imagery	Training data		Validation data
		BC	OC	BC	OC
A	QuickBird	128	164	85	85
B	WorldView-2	107	104	85	85
C	WorldView-2	130	134	85	85